How to change Build Option for Page on runtime in Oracle APEX

    first make select list item  P7_BUILD_OPTION

that will contain all Build Option available for your APP

use this code as source 

  select patch_name||' ('||wwv_flow_lang.system_message(patch_status)||')' d, id r 

  from APEX_200200.wwv_flow_patches where FLOW_ID = :APP_ID

and make process to update Page Build Option

BEGIN

UPDATE APEX_200200.wwv_flow_steps -

SET REQUIRED_PATCH = :P7_BUILD_OPTION  

 WHERE FLOW_ID = :P7_FLOW_ID 

 and ID = :P7_STEP_ID ; 

end;

--
thanks